Perseus Digital Library
Collection, under development since 1987, covers the history, literature and culture of the Greco-Roman world.
CDRI: Digital resources for the study of religion
The CDRI database provides access to digital images of woodcuts, photographs, slides, papyri, coins, maps, postcards, manuscripts, lithographs, sermons, shape-note tune books, and various forms of Christian art, architecture, and iconography.
Stanford Encyclopedia of Philosophy
A resource for philosophy.